Mechanical properties of regenerated coracoacromial ligament after subacromial decompression.

Recent publications suggest that the coracoacromial ligament regenerates after it has been partially excised during subacromial decompression or acromioplasty. This observation may aid the understanding of the successes and failures of this very commonly performed surgical procedure. This study determines the mechanical properties of the apparently regenerated ligament. Eight regenerated coracoacromial ligaments were excised during revision surgery after subacromial decompression and were taken for mechanical testing. It appears that the ligament does have the ability to re-form relatively quickly after subacromial decompression or acromioplasty but takes time to regain strength. The results indicate that the ligament may possibly regain normal mechanical properties after regeneration times in excess of 3 years.